Lamp holder



FIG. 1 is a perspective of the lamp holder showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a lamp holder, substantially as shown and described. 